Li Hua is a volunteer．She will put up a sign to remind people to save every drop of water．Which of the following signs should she choose？（ ）
A．
B．
C．
D．
Li Hua is a volunteer．She will put up a sign to remind people to save every drop of water．Which of the following signs should she choose？（ ）
A．B．
C．D．
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